Makefile

   1 # These variables are specifically meant to be overridable via the make
   2 # command-line.
   3 # ?= doesn't work for CC and AR because make has a default value for them.
   4 ifeq ($(origin CC), default)
   5 CC := clang
   6 endif
   7 NM ?= $(patsubst %clang,%llvm-nm,$(filter-out ccache sccache,$(CC)))
   8 ifeq ($(origin AR), default)
   9 AR = $(patsubst %clang,%llvm-ar,$(filter-out ccache sccache,$(CC)))
  10 endif
  11 EXTRA_CFLAGS ?= -O2 -DNDEBUG
  12 # The directory where we build the sysroot.
  13 SYSROOT ?= $(CURDIR)/sysroot
  14 # A directory to install to for "make install".
  15 INSTALL_DIR ?= /usr/local
  16 # single or posix; note that pthread support is still a work-in-progress.
  17 THREAD_MODEL ?= single
  18 # dlmalloc or none
  19 MALLOC_IMPL ?= dlmalloc
  20 # yes or no
  21 BUILD_LIBC_TOP_HALF ?= yes
  22 # The directory where we will store intermediate artifacts.
  23 OBJDIR ?= $(CURDIR)/build/$(TARGET_TRIPLE)
  24
  25 # When the length is no larger than this threshold, we consider the
  26 # overhead of bulk memory opcodes to outweigh the performance benefit,
  27 # and fall back to the original musl implementation. See
  28 # https://github.com/WebAssembly/wasi-libc/pull/263 for relevant
  29 # discussion
  30 BULK_MEMORY_THRESHOLD ?= 32
  31
  32 # Variables from this point on are not meant to be overridable via the
  33 # make command-line.
  34
  35 # Set the default WASI target triple.
  36 TARGET_TRIPLE = wasm32-wasi
  37
  38 # Threaded version necessitates a different traget, as objects from different
  39 # targets can't be mixed together while linking.
  40 ifeq ($(THREAD_MODEL), posix)
  41 TARGET_TRIPLE = wasm32-wasi-threads
  42 endif
  43
  44 # These variables describe the locations of various files and directories in
  45 # the source tree.
  46 DLMALLOC_DIR = $(CURDIR)/dlmalloc
  47 DLMALLOC_SRC_DIR = $(DLMALLOC_DIR)/src
  48 DLMALLOC_SOURCES = $(DLMALLOC_SRC_DIR)/dlmalloc.c
  49 DLMALLOC_INC = $(DLMALLOC_DIR)/include
  50 EMMALLOC_DIR = $(CURDIR)/emmalloc
  51 EMMALLOC_SOURCES = $(EMMALLOC_DIR)/emmalloc.c
  52 LIBC_BOTTOM_HALF_DIR = $(CURDIR)/libc-bottom-half
  53 LIBC_BOTTOM_HALF_CLOUDLIBC_SRC = $(LIBC_BOTTOM_HALF_DIR)/cloudlibc/src
  54 LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC = $(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)/include
  55 LIBC_BOTTOM_HALF_HEADERS_PUBLIC = $(LIBC_BOTTOM_HALF_DIR)/headers/public
  56 LIBC_BOTTOM_HALF_HEADERS_PRIVATE = $(LIBC_BOTTOM_HALF_DIR)/headers/private
  57 LIBC_BOTTOM_HALF_SOURCES = $(LIBC_BOTTOM_HALF_DIR)/sources
  58 LIBC_BOTTOM_HALF_ALL_SOURCES = \
  59     $(sort \
  60     $(shell find $(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC) -name \*.c) \
  61     $(shell find $(LIBC_BOTTOM_HALF_SOURCES) -name \*.c))
  62
  63 # FIXME(https://reviews.llvm.org/D85567) - due to a bug in LLD the weak
  64 # references to a function defined in `chdir.c` only work if `chdir.c` is at the
  65 # end of the archive, but once that LLD review lands and propagates into LLVM
  66 # then we don't have to do this.
  67 LIBC_BOTTOM_HALF_ALL_SOURCES := $(filter-out $(LIBC_BOTTOM_HALF_SOURCES)/chdir.c,$(LIBC_BOTTOM_HALF_ALL_SOURCES))
  68 LIBC_BOTTOM_HALF_ALL_SOURCES := $(LIBC_BOTTOM_HALF_ALL_SOURCES) $(LIBC_BOTTOM_HALF_SOURCES)/chdir.c
  69
  70 LIBWASI_EMULATED_MMAN_SOURCES = \
  71     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/mman -name \*.c))
  72 LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES = \
  73     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/clocks -name \*.c))
  74 LIBWASI_EMULATED_GETPID_SOURCES = \
  75     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/getpid -name \*.c))
  76 LIBWASI_EMULATED_SIGNAL_SOURCES = \
  77     $(sort $(shell find $(LIBC_BOTTOM_HALF_DIR)/signal -name \*.c))
  78 LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES = \
  79     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/signal/psignal.c \
  80     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/strsignal.c
  81 LIBC_BOTTOM_HALF_CRT_SOURCES = $(wildcard $(LIBC_BOTTOM_HALF_DIR)/crt/*.c)
  82 LIBC_TOP_HALF_DIR = $(CURDIR)/libc-top-half
  83 LIBC_TOP_HALF_MUSL_DIR = $(LIBC_TOP_HALF_DIR)/musl
  84 LIBC_TOP_HALF_MUSL_SRC_DIR = $(LIBC_TOP_HALF_MUSL_DIR)/src
  85 LIBC_TOP_HALF_MUSL_INC = $(LIBC_TOP_HALF_MUSL_DIR)/include
  86 LIBC_TOP_HALF_MUSL_SOURCES = \
  87     $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
  88         misc/a64l.c \
  89         misc/basename.c \
  90         misc/dirname.c \
  91         misc/ffs.c \
  92         misc/ffsl.c \
  93         misc/ffsll.c \
  94         misc/fmtmsg.c \
  95         misc/getdomainname.c \
  96         misc/gethostid.c \
  97         misc/getopt.c \
  98         misc/getopt_long.c \
  99         misc/getsubopt.c \
 100         misc/uname.c \
 101         misc/nftw.c \
 102         errno/strerror.c \
 103         network/htonl.c \
 104         network/htons.c \
 105         network/ntohl.c \
 106         network/ntohs.c \
 107         network/inet_ntop.c \
 108         network/inet_pton.c \
 109         network/inet_aton.c \
 110         network/in6addr_any.c \
 111         network/in6addr_loopback.c \
 112         fenv/fenv.c \
 113         fenv/fesetround.c \
 114         fenv/feupdateenv.c \
 115         fenv/fesetexceptflag.c \
 116         fenv/fegetexceptflag.c \
 117         fenv/feholdexcept.c \
 118         exit/exit.c \
 119         exit/atexit.c \
 120         exit/assert.c \
 121         exit/quick_exit.c \
 122         exit/at_quick_exit.c \
 123         time/strftime.c \
 124         time/asctime.c \
 125         time/asctime_r.c \
 126         time/ctime.c \
 127         time/ctime_r.c \
 128         time/wcsftime.c \
 129         time/strptime.c \
 130         time/difftime.c \
 131         time/timegm.c \
 132         time/ftime.c \
 133         time/gmtime.c \
 134         time/gmtime_r.c \
 135         time/timespec_get.c \
 136         time/getdate.c \
 137         time/localtime.c \
 138         time/localtime_r.c \
 139         time/mktime.c \
 140         time/__tm_to_secs.c \
 141         time/__month_to_secs.c \
 142         time/__secs_to_tm.c \
 143         time/__year_to_secs.c \
 144         time/__tz.c \
 145         fcntl/creat.c \
 146         dirent/alphasort.c \
 147         dirent/versionsort.c \
 148         env/__stack_chk_fail.c \
 149         env/clearenv.c \
 150         env/getenv.c \
 151         env/putenv.c \
 152         env/setenv.c \
 153         env/unsetenv.c \
 154         unistd/posix_close.c \
 155         stat/futimesat.c \
 156         legacy/getpagesize.c \
 157         thread/thrd_sleep.c \
 158     ) \
 159     $(filter-out %/procfdname.c %/syscall.c %/syscall_ret.c %/vdso.c %/version.c, \
 160                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal/*.c)) \
 161     $(filter-out %/flockfile.c %/funlockfile.c %/__lockfile.c %/ftrylockfile.c \
 162                  %/rename.c \
 163                  %/tmpnam.c %/tmpfile.c %/tempnam.c \
 164                  %/popen.c %/pclose.c \
 165                  %/remove.c \
 166                  %/gets.c, \
 167                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/*.c)) \
 168     $(filter-out %/strsignal.c, \
 169                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/*.c)) \
 170     $(filter-out %/dcngettext.c %/textdomain.c %/bind_textdomain_codeset.c, \
 171                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/locale/*.c)) \
 172     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/*.c) \
 173     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/search/*.c) \
 174     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/multibyte/*.c) \
 175     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/regex/*.c) \
 176     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/prng/*.c) \
 177     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/conf/*.c) \
 178     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/ctype/*.c) \
 179     $(filter-out %/__signbit.c %/__signbitf.c %/__signbitl.c \
 180                  %/__fpclassify.c %/__fpclassifyf.c %/__fpclassifyl.c \
 181                  %/ceilf.c %/ceil.c \
 182                  %/floorf.c %/floor.c \
 183                  %/truncf.c %/trunc.c \
 184                  %/rintf.c %/rint.c \
 185                  %/nearbyintf.c %/nearbyint.c \
 186                  %/sqrtf.c %/sqrt.c \
 187                  %/fabsf.c %/fabs.c \
 188                  %/copysignf.c %/copysign.c \
 189                  %/fminf.c %/fmaxf.c \
 190                  %/fmin.c %/fmax.c, \
 191                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/math/*.c)) \
 192     $(filter-out %/crealf.c %/creal.c %creall.c \
 193                  %/cimagf.c %/cimag.c %cimagl.c, \
 194                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/complex/*.c)) \
 195     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/crypt/*.c)
 196
 197 ifeq ($(THREAD_MODEL), posix)
 198 LIBC_TOP_HALF_MUSL_SOURCES += \
 199     $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
 200         env/__init_tls.c \
 201         stdio/__lockfile.c \
 202         stdio/flockfile.c \
 203         stdio/ftrylockfile.c \
 204         stdio/funlockfile.c \
 205         thread/__lock.c \
 206         thread/__wait.c \
 207         thread/__timedwait.c \
 208         thread/default_attr.c \
 209         thread/pthread_attr_destroy.c \
 210         thread/pthread_attr_get.c \
 211         thread/pthread_attr_init.c \
 212         thread/pthread_attr_setstack.c \
 213         thread/pthread_attr_setdetachstate.c \
 214         thread/pthread_attr_setstacksize.c \
 215         thread/pthread_barrier_destroy.c \
 216         thread/pthread_barrier_init.c \
 217         thread/pthread_barrier_wait.c \
 218         thread/pthread_cleanup_push.c \
 219         thread/pthread_cond_broadcast.c \
 220         thread/pthread_cond_destroy.c \
 221         thread/pthread_cond_init.c \
 222         thread/pthread_cond_signal.c \
 223         thread/pthread_cond_timedwait.c \
 224         thread/pthread_cond_wait.c \
 225         thread/pthread_condattr_destroy.c \
 226         thread/pthread_condattr_init.c \
 227         thread/pthread_condattr_setclock.c \
 228         thread/pthread_condattr_setpshared.c \
 229         thread/pthread_create.c \
 230         thread/pthread_detach.c \
 231         thread/pthread_equal.c \
 232         thread/pthread_getspecific.c \
 233         thread/pthread_join.c \
 234         thread/pthread_key_create.c \
 235         thread/pthread_mutex_consistent.c \
 236         thread/pthread_mutex_destroy.c \
 237         thread/pthread_mutex_init.c \
 238         thread/pthread_mutex_getprioceiling.c \
 239         thread/pthread_mutex_lock.c \
 240         thread/pthread_mutex_timedlock.c \
 241         thread/pthread_mutex_trylock.c \
 242         thread/pthread_mutex_unlock.c \
 243         thread/pthread_mutexattr_destroy.c \
 244         thread/pthread_mutexattr_init.c \
 245         thread/pthread_mutexattr_setprotocol.c \
 246         thread/pthread_mutexattr_setpshared.c \
 247         thread/pthread_mutexattr_setrobust.c \
 248         thread/pthread_mutexattr_settype.c \
 249         thread/pthread_once.c \
 250         thread/pthread_rwlock_destroy.c \
 251         thread/pthread_rwlock_init.c \
 252         thread/pthread_rwlock_rdlock.c \
 253         thread/pthread_rwlock_timedrdlock.c \
 254         thread/pthread_rwlock_timedwrlock.c \
 255         thread/pthread_rwlock_tryrdlock.c \
 256         thread/pthread_rwlock_trywrlock.c \
 257         thread/pthread_rwlock_unlock.c \
 258         thread/pthread_rwlock_wrlock.c \
 259         thread/pthread_rwlockattr_destroy.c \
 260         thread/pthread_rwlockattr_init.c \
 261         thread/pthread_rwlockattr_setpshared.c \
 262         thread/pthread_setcancelstate.c \
 263         thread/pthread_setspecific.c \
 264         thread/pthread_self.c \
 265         thread/pthread_testcancel.c \
 266         thread/sem_destroy.c \
 267         thread/sem_getvalue.c \
 268         thread/sem_init.c \
 269         thread/sem_post.c \
 270         thread/sem_timedwait.c \
 271         thread/sem_trywait.c \
 272         thread/sem_wait.c \
 273         thread/wasm32/wasi_thread_start.s \
 274     )
 275 endif
 276
 277 MUSL_PRINTSCAN_SOURCES = \
 278     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal/floatscan.c \
 279     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfprintf.c \
 280     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfwprintf.c \
 281     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdio/vfscanf.c \
 282     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/strtod.c \
 283     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/stdlib/wcstod.c
 284 BULK_MEMORY_SOURCES = \
 285     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memcpy.c \
 286     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memmove.c \
 287     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memset.c
 288 LIBC_TOP_HALF_HEADERS_PRIVATE = $(LIBC_TOP_HALF_DIR)/headers/private
 289 LIBC_TOP_HALF_SOURCES = $(LIBC_TOP_HALF_DIR)/sources
 290 LIBC_TOP_HALF_ALL_SOURCES = \
 291     $(LIBC_TOP_HALF_MUSL_SOURCES) \
 292     $(sort $(shell find $(LIBC_TOP_HALF_SOURCES) -name \*.[cs]))
 293
 294 # Add any extra flags
 295 CFLAGS = $(EXTRA_CFLAGS)
 296 # Set the target.
 297 CFLAGS += --target=$(TARGET_TRIPLE)
 298 ASMFLAGS += --target=$(TARGET_TRIPLE)
 299 # WebAssembly floating-point match doesn't trap.
 300 # TODO: Add -fno-signaling-nans when the compiler supports it.
 301 CFLAGS += -fno-trapping-math
 302 # Add all warnings, but disable a few which occur in third-party code.
 303 CFLAGS += -Wall -Wextra -Werror \
 304   -Wno-null-pointer-arithmetic \
 305   -Wno-unused-parameter \
 306   -Wno-sign-compare \
 307   -Wno-unused-variable \
 308   -Wno-unused-function \
 309   -Wno-ignored-attributes \
 310   -Wno-missing-braces \
 311   -Wno-ignored-pragmas \
 312   -Wno-unused-but-set-variable \
 313   -Wno-unknown-warning-option
 314
 315 # Configure support for threads.
 316 ifeq ($(THREAD_MODEL), single)
 317 CFLAGS += -mthread-model single
 318 endif
 319 ifeq ($(THREAD_MODEL), posix)
 320 # Specify the tls-model until LLVM 15 is released (which should contain
 321 # https://reviews.llvm.org/D130053).
 322 CFLAGS += -mthread-model posix -pthread -ftls-model=local-exec
 323
 324 # Include cloudlib's directory to access the structure definition of clockid_t
 325 CFLAGS += -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
 326 endif
 327
 328 # Expose the public headers to the implementation. We use `-isystem` for
 329 # purpose for two reasons:
 330 #
 331 # 1. It only does `<...>` not `"...."` lookup. We are making a libc,
 332 #    which is a system library, so all public headers should be
 333 #    accessible via `<...>` and never also need `"..."`. `-isystem` main
 334 #    purpose is to only effect `<...>` lookup.
 335 #
 336 # 2. The `-I` for private headers added for specific C files below
 337 #    should come earlier in the search path, so they can "override"
 338 #    and/or `#include_next` the public headers. `-isystem` (like
 339 #    `-idirafter`) comes later in the search path than `-I`.
 340 CFLAGS += -isystem "$(SYSROOT_INC)"
 341
 342 # These variables describe the locations of various files and directories in
 343 # the build tree.
 344 objs = $(patsubst $(CURDIR)/%.c,$(OBJDIR)/%.o,$(1))
 345 asmobjs = $(patsubst $(CURDIR)/%.s,$(OBJDIR)/%.o,$(1))
 346 DLMALLOC_OBJS = $(call objs,$(DLMALLOC_SOURCES))
 347 EMMALLOC_OBJS = $(call objs,$(EMMALLOC_SOURCES))
 348 LIBC_BOTTOM_HALF_ALL_OBJS = $(call objs,$(LIBC_BOTTOM_HALF_ALL_SOURCES))
 349 LIBC_TOP_HALF_ALL_OBJS = $(call asmobjs,$(call objs,$(LIBC_TOP_HALF_ALL_SOURCES)))
 350 ifeq ($(MALLOC_IMPL),dlmalloc)
 351 LIBC_OBJS += $(DLMALLOC_OBJS)
 352 else ifeq ($(MALLOC_IMPL),emmalloc)
 353 LIBC_OBJS += $(EMMALLOC_OBJS)
 354 else ifeq ($(MALLOC_IMPL),none)
 355 # No object files to add.
 356 else
 357 $(error unknown malloc implementation $(MALLOC_IMPL))
 358 endif
 359 # Add libc-bottom-half's objects.
 360 LIBC_OBJS += $(LIBC_BOTTOM_HALF_ALL_OBJS)
 361 ifeq ($(BUILD_LIBC_TOP_HALF),yes)
 362 # libc-top-half is musl.
 363 LIBC_OBJS += $(LIBC_TOP_HALF_ALL_OBJS)
 364 endif
 365 MUSL_PRINTSCAN_OBJS = $(call objs,$(MUSL_PRINTSCAN_SOURCES))
 366 MUSL_PRINTSCAN_LONG_DOUBLE_OBJS = $(patsubst %.o,%.long-double.o,$(MUSL_PRINTSCAN_OBJS))
 367 MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS = $(patsubst %.o,%.no-floating-point.o,$(MUSL_PRINTSCAN_OBJS))
 368 BULK_MEMORY_OBJS = $(call objs,$(BULK_MEMORY_SOURCES))
 369 LIBWASI_EMULATED_MMAN_OBJS = $(call objs,$(LIBWASI_EMULATED_MMAN_SOURCES))
 370 LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS = $(call objs,$(LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES))
 371 LIBWASI_EMULATED_GETPID_OBJS = $(call objs,$(LIBWASI_EMULATED_GETPID_SOURCES))
 372 LIBWASI_EMULATED_SIGNAL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_SOURCES))
 373 LIBWASI_EMULATED_SIGNAL_MUSL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES))
 374
 375 # These variables describe the locations of various files and
 376 # directories in the generated sysroot tree.
 377 SYSROOT_LIB := $(SYSROOT)/lib/$(TARGET_TRIPLE)
 378 SYSROOT_INC = $(SYSROOT)/include
 379 SYSROOT_SHARE = $(SYSROOT)/share/$(TARGET_TRIPLE)
 380
 381 # Files from musl's include directory that we don't want to install in the
 382 # sysroot's include directory.
 383 MUSL_OMIT_HEADERS :=
 384
 385 # Remove files which aren't headers (we generate alltypes.h below).
 386 MUSL_OMIT_HEADERS += \
 387     "bits/syscall.h.in" \
 388     "bits/alltypes.h.in" \
 389     "alltypes.h.in"
 390
 391 # Use the compiler's version of these headers.
 392 MUSL_OMIT_HEADERS += \
 393     "stdarg.h" \
 394     "stddef.h"
 395
 396 # Use the WASI errno definitions.
 397 MUSL_OMIT_HEADERS += \
 398     "bits/errno.h"
 399
 400 # Remove headers that aren't supported yet or that aren't relevant for WASI.
 401 MUSL_OMIT_HEADERS += \
 402     "sys/procfs.h" \
 403     "sys/user.h" \
 404     "sys/kd.h" "sys/vt.h" "sys/soundcard.h" "sys/sem.h" \
 405     "sys/shm.h" "sys/msg.h" "sys/ipc.h" "sys/ptrace.h" \
 406     "sys/statfs.h" \
 407     "bits/kd.h" "bits/vt.h" "bits/soundcard.h" "bits/sem.h" \
 408     "bits/shm.h" "bits/msg.h" "bits/ipc.h" "bits/ptrace.h" \
 409     "bits/statfs.h" \
 410     "sys/vfs.h" \
 411     "sys/statvfs.h" \
 412     "syslog.h" "sys/syslog.h" \
 413     "wait.h" "sys/wait.h" \
 414     "ucontext.h" "sys/ucontext.h" \
 415     "paths.h" \
 416     "utmp.h" "utmpx.h" \
 417     "lastlog.h" \
 418     "sys/acct.h" \
 419     "sys/cachectl.h" \
 420     "sys/epoll.h" "sys/reboot.h" "sys/swap.h" \
 421     "sys/sendfile.h" "sys/inotify.h" \
 422     "sys/quota.h" \
 423     "sys/klog.h" \
 424     "sys/fsuid.h" \
 425     "sys/io.h" \
 426     "sys/prctl.h" \
 427     "sys/mtio.h" \
 428     "sys/mount.h" \
 429     "sys/fanotify.h" \
 430     "sys/personality.h" \
 431     "elf.h" "link.h" "bits/link.h" \
 432     "scsi/scsi.h" "scsi/scsi_ioctl.h" "scsi/sg.h" \
 433     "sys/auxv.h" \
 434     "pwd.h" "shadow.h" "grp.h" \
 435     "mntent.h" \
 436     "netdb.h" \
 437     "resolv.h" \
 438     "pty.h" \
 439     "dlfcn.h" \
 440     "setjmp.h" \
 441     "ulimit.h" \
 442     "sys/xattr.h" \
 443     "wordexp.h" \
 444     "spawn.h" \
 445     "sys/membarrier.h" \
 446     "sys/signalfd.h" \
 447     "termios.h" \
 448     "sys/termios.h" \
 449     "bits/termios.h" \
 450     "net/if.h" \
 451     "net/if_arp.h" \
 452     "net/ethernet.h" \
 453     "net/route.h" \
 454     "netinet/if_ether.h" \
 455     "netinet/ether.h" \
 456     "sys/timerfd.h" \
 457     "libintl.h" \
 458     "sys/sysmacros.h" \
 459     "aio.h"
 460
 461 ifeq ($(THREAD_MODEL), single)
 462 # Remove headers not supported in single-threaded mode.
 463 MUSL_OMIT_HEADERS += "pthread.h"
 464 endif
 465
 466 default: finish
 467
 468 $(SYSROOT_LIB)/libc.a: $(LIBC_OBJS)
 469
 470 $(SYSROOT_LIB)/libc-printscan-long-double.a: $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS)
 471
 472 $(SYSROOT_LIB)/libc-printscan-no-floating-point.a: $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS)
 473
 474 $(SYSROOT_LIB)/libwasi-emulated-mman.a: $(LIBWASI_EMULATED_MMAN_OBJS)
 475
 476 $(SYSROOT_LIB)/libwasi-emulated-process-clocks.a: $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS)
 477
 478 $(SYSROOT_LIB)/libwasi-emulated-getpid.a: $(LIBWASI_EMULATED_GETPID_OBJS)
 479
 480 $(SYSROOT_LIB)/libwasi-emulated-signal.a: $(LIBWASI_EMULATED_SIGNAL_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS)
 481
 482 %.a:
 483         @mkdir -p "$(@D)"
 484         # On Windows, the commandline for the ar invocation got too long, so it needs to be split up.
 485         $(AR) crs $@ $(wordlist 1, 199, $^)
 486         $(AR) crs $@ $(wordlist 200, 399, $^)
 487         $(AR) crs $@ $(wordlist 400, 599, $^)
 488         $(AR) crs $@ $(wordlist 600, 799, $^)
 489         # This might eventually overflow again, but at least it'll do so in a loud way instead of
 490         # silently dropping the tail.
 491         $(AR) crs $@ $(wordlist 800, 100000, $^)
 492
 493 $(MUSL_PRINTSCAN_OBJS): CFLAGS += \
 494             -D__wasilibc_printscan_no_long_double \
 495             -D__wasilibc_printscan_full_support_option="\"add -lc-printscan-long-double to the link command\""
 496
 497 $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS): CFLAGS += \
 498             -D__wasilibc_printscan_no_floating_point \
 499             -D__wasilibc_printscan_floating_point_support_option="\"remove -lc-printscan-no-floating-point from the link command\""
 500
 501 # TODO: apply -mbulk-memory globally, once
 502 # https://github.com/llvm/llvm-project/issues/52618 is resolved
 503 $(BULK_MEMORY_OBJS): CFLAGS += \
 504         -mbulk-memory
 505
 506 $(BULK_MEMORY_OBJS): CFLAGS += \
 507         -DBULK_MEMORY_THRESHOLD=$(BULK_MEMORY_THRESHOLD)
 508
 509 $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS): CFLAGS += \
 510             -D_WASI_EMULATED_SIGNAL
 511
 512 $(OBJDIR)/%.long-double.o: $(CURDIR)/%.c include_dirs
 513         @mkdir -p "$(@D)"
 514         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 515
 516 $(OBJDIR)/%.no-floating-point.o: $(CURDIR)/%.c include_dirs
 517         @mkdir -p "$(@D)"
 518         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 519
 520 $(OBJDIR)/%.o: $(CURDIR)/%.c include_dirs
 521         @mkdir -p "$(@D)"
 522         $(CC) $(CFLAGS) -MD -MP -o $@ -c $<
 523
 524 $(OBJDIR)/%.o: $(CURDIR)/%.s include_dirs
 525         @mkdir -p "$(@D)"
 526         $(CC) $(ASMFLAGS) -o $@ -c $<
 527
 528 -include $(shell find $(OBJDIR) -name \*.d)
 529
 530 $(DLMALLOC_OBJS): CFLAGS += \
 531     -I$(DLMALLOC_INC)
 532
 533 startup_files $(LIBC_BOTTOM_HALF_ALL_OBJS): CFLAGS += \
 534     -I$(LIBC_BOTTOM_HALF_HEADERS_PRIVATE) \
 535     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC) \
 536     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC) \
 537     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
 538     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal
 539
 540 $(LIBC_TOP_HALF_ALL_OBJS) $(MUSL_PRINTSCAN_LONG_DOUBLE_OBJS) $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS): CFLAGS += \
 541     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
 542     -I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal \
 543     -I$(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32 \
 544     -I$(LIBC_TOP_HALF_MUSL_DIR)/arch/generic \
 545     -I$(LIBC_TOP_HALF_HEADERS_PRIVATE) \
 546     -Wno-parentheses \
 547     -Wno-shift-op-parentheses \
 548     -Wno-bitwise-op-parentheses \
 549     -Wno-logical-op-parentheses \
 550     -Wno-string-plus-int \
 551     -Wno-dangling-else \
 552     -Wno-unknown-pragmas
 553
 554 $(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS): CFLAGS += \
 555     -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
 556
 557 include_dirs:
 558         #
 559         # Install the include files.
 560         #
 561         mkdir -p "$(SYSROOT_INC)"
 562         cp -r "$(LIBC_BOTTOM_HALF_HEADERS_PUBLIC)"/* "$(SYSROOT_INC)"
 563
 564         # Generate musl's bits/alltypes.h header.
 565         mkdir -p "$(SYSROOT_INC)/bits"
 566         sed -f $(LIBC_TOP_HALF_MUSL_DIR)/tools/mkalltypes.sed \
 567             $(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32/bits/alltypes.h.in \
 568             $(LIBC_TOP_HALF_MUSL_DIR)/include/alltypes.h.in \
 569             > "$(SYSROOT_INC)/bits/alltypes.h"
 570
 571         # Copy in the bulk of musl's public header files.
 572         cp -r "$(LIBC_TOP_HALF_MUSL_INC)"/* "$(SYSROOT_INC)"
 573         # Copy in the musl's "bits" header files.
 574         cp -r "$(LIBC_TOP_HALF_MUSL_DIR)"/arch/generic/bits/* "$(SYSROOT_INC)/bits"
 575         cp -r "$(LIBC_TOP_HALF_MUSL_DIR)"/arch/wasm32/bits/* "$(SYSROOT_INC)/bits"
 576
 577         # Remove selected header files.
 578         $(RM) $(patsubst %,$(SYSROOT_INC)/%,$(MUSL_OMIT_HEADERS))
 579
 580 startup_files: include_dirs
 581         #
 582         # Build the startup files.
 583         #
 584         @mkdir -p "$(OBJDIR)"
 585         cd "$(OBJDIR)" && \
 586         $(CC) $(CFLAGS) -c $(LIBC_BOTTOM_HALF_CRT_SOURCES) -MD -MP && \
 587         mkdir -p "$(SYSROOT_LIB)" && \
 588         mv *.o "$(SYSROOT_LIB)"
 589
 590 libc: include_dirs \
 591     $(SYSROOT_LIB)/libc.a \
 592     $(SYSROOT_LIB)/libc-printscan-long-double.a \
 593     $(SYSROOT_LIB)/libc-printscan-no-floating-point.a \
 594     $(SYSROOT_LIB)/libwasi-emulated-mman.a \
 595     $(SYSROOT_LIB)/libwasi-emulated-process-clocks.a \
 596     $(SYSROOT_LIB)/libwasi-emulated-getpid.a \
 597     $(SYSROOT_LIB)/libwasi-emulated-signal.a
 598
 599 finish: startup_files libc
 600         #
 601         # Create empty placeholder libraries.
 602         #
 603         for name in m rt pthread crypt util xnet resolv dl; do \
 604             $(AR) crs "$(SYSROOT_LIB)/lib$${name}.a"; \
 605         done
 606
 607         #
 608         # The build succeeded! The generated sysroot is in $(SYSROOT).
 609         #
 610
 611 # The check for defined and undefined symbols expects there to be a heap
 612 # alloctor (providing malloc, calloc, free, etc). Skip this step if the build
 613 # is done without a malloc implementation.
 614 ifneq ($(MALLOC_IMPL),none)
 615 finish: check-symbols
 616 endif
 617
 618 DEFINED_SYMBOLS = $(SYSROOT_SHARE)/defined-symbols.txt
 619 UNDEFINED_SYMBOLS = $(SYSROOT_SHARE)/undefined-symbols.txt
 620
 621 check-symbols: startup_files libc
 622         #
 623         # Collect metadata on the sysroot and perform sanity checks.
 624         #
 625         mkdir -p "$(SYSROOT_SHARE)"
 626
 627         #
 628         # Collect symbol information.
 629         #
 630         @# TODO: Use llvm-nm --extern-only instead of grep. This is blocked on
 631         @# LLVM PR40497, which is fixed in 9.0, but not in 8.0.
 632         @# Ignore certain llvm builtin symbols such as those starting with __mul
 633         @# since these dependencies can vary between llvm versions.
 634         "$(NM)" --defined-only "$(SYSROOT_LIB)"/libc.a "$(SYSROOT_LIB)"/libwasi-emulated-*.a "$(SYSROOT_LIB)"/*.o \
 635             |grep ' [[:upper:]] ' |sed 's/.* [[:upper:]] //' |LC_ALL=C sort |uniq > "$(DEFINED_SYMBOLS)"
 636         for undef_sym in $$("$(NM)" --undefined-only "$(SYSROOT_LIB)"/libc.a "$(SYSROOT_LIB)"/libc-*.a "$(SYSROOT_LIB)"/*.o \
 637             |grep ' U ' |sed 's/.* U //' |LC_ALL=C sort |uniq); do \
 638             grep -q '\<'$$undef_sym'\>' "$(DEFINED_SYMBOLS)" || echo $$undef_sym; \
 639         done | grep -v "^__mul" > "$(UNDEFINED_SYMBOLS)"
 640         grep '^_*imported_wasi_' "$(UNDEFINED_SYMBOLS)" \
 641             > "$(SYSROOT_LIB)/libc.imports"
 642
 643         #
 644         # Generate a test file that includes all public C header files.
 645         #
 646         cd "$(SYSROOT_INC)" && \
 647           for header in $$(find . -type f -not -name mman.h -not -name signal.h -not -name times.h -not -name resource.h |grep -v /bits/ |grep -v /c++/); do \
 648               echo '#include <'$$header'>' | sed 's/\.\///' ; \
 649         done |LC_ALL=C sort >$(SYSROOT_SHARE)/include-all.c ; \
 650         cd - >/dev/null
 651
 652         #
 653         # Test that it compiles.
 654         #
 655         $(CC) $(CFLAGS) -fsyntax-only "$(SYSROOT_SHARE)/include-all.c" -Wno-\#warnings
 656
 657         #
 658         # Collect all the predefined macros, except for compiler version macros
 659         # which we don't need to track here.
 660         #
 661         @#
 662         @# For the __*_ATOMIC_*_LOCK_FREE macros, squash individual compiler names
 663         @# to attempt, toward keeping these files compiler-independent.
 664         @#
 665         @# We have to add `-isystem $(SYSROOT_INC)` because otherwise clang puts
 666         @# its builtin include path first, which produces compiler-specific
 667         @# output.
 668         @#
 669         @# TODO: Filter out __NO_MATH_ERRNO_ and a few __*WIDTH__ that are new to clang 14.
 670         @# TODO: Filter out __GCC_HAVE_SYNC_COMPARE_AND_SWAP_* that are new to clang 16.
 671         @# TODO: clang defined __FLT_EVAL_METHOD__ until clang 15, so we force-undefine it
 672         @# for older versions.
 673         @# TODO: Undefine __wasm_mutable_globals__ and __wasm_sign_ext__, that are new to
 674         @# clang 16 for -mcpu=generic.
 675         @# TODO: As of clang 16, __GNUC_VA_LIST is #defined without a value.
 676         $(CC) $(CFLAGS) "$(SYSROOT_SHARE)/include-all.c" \
 677             -isystem $(SYSROOT_INC) \
 678             -std=gnu17 \
 679             -E -dM -Wno-\#warnings \
 680             -D_ALL_SOURCE \
 681             -U__llvm__ \
 682             -U__clang__ \
 683             -U__clang_major__ \
 684             -U__clang_minor__ \
 685             -U__clang_patchlevel__ \
 686             -U__clang_version__ \
 687             -U__clang_literal_encoding__ \
 688             -U__clang_wide_literal_encoding__ \
 689             -U__wasm_mutable_globals__ \
 690             -U__wasm_sign_ext__ \
 691             -U__GNUC__ \
 692             -U__GNUC_MINOR__ \
 693             -U__GNUC_PATCHLEVEL__ \
 694             -U__VERSION__ \
 695             -U__NO_MATH_ERRNO__ \
 696             -U__BITINT_MAXWIDTH__ \
 697             -U__FLT_EVAL_METHOD__ -Wno-builtin-macro-redefined \
 698             | sed -e 's/__[[:upper:][:digit:]]*_ATOMIC_\([[:upper:][:digit:]_]*\)_LOCK_FREE/__compiler_ATOMIC_\1_LOCK_FREE/' \
 699             | sed -e 's/__GNUC_VA_LIST $$/__GNUC_VA_LIST 1/' \
 700             | grep -v '^#define __\(BOOL\|INT_\(LEAST\|FAST\)\(8\|16\|32\|64\)\|INT\|LONG\|LLONG\|SHRT\)_WIDTH__' \
 701             | grep -v '^#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_\(1\|2\|4\|8\)' \
 702             > "$(SYSROOT_SHARE)/predefined-macros.txt"
 703
 704         # Check that the computed metadata matches the expected metadata.
 705         # This ignores whitespace because on Windows the output has CRLF line endings.
 706         diff -wur "$(CURDIR)/expected/$(TARGET_TRIPLE)" "$(SYSROOT_SHARE)"
 707
 708 install: finish
 709         mkdir -p "$(INSTALL_DIR)"
 710         cp -r "$(SYSROOT)/lib" "$(SYSROOT)/share" "$(SYSROOT)/include" "$(INSTALL_DIR)"
 711
 712 clean:
 713         $(RM) -r "$(OBJDIR)"
 714         $(RM) -r "$(SYSROOT)"
 715
 716 .PHONY: default startup_files libc finish install include_dirs clean